STRUCTURAL FIRE PRECAUTIONS D - South Ayrshire Council

D
D3.14 – D4.2
d. where there is a service opening -
i. which is of suitable construction, or where the services are suitably protected, so that in the
event of fire the level of fire safety performance required of the compartment wall or compartment
floor is maintained, and
ii.
which is suitably fire-stopped; or
e. where there is an opening in the compartment floor, which contains a stair only, other than an
escape stair, and/or not more than 2 escalators, and is provided either -
i. at compartment floor level with a suitably activated shutter in the plane of the floor which
when closed maintains the level of fire safety performance of the compartment floor, or
ii.
at each floor level, other than the top floor level, with a suitably activated shutter in the vertical
plane which moves to enclose the opening and provide a barrier with the fire safety performance
equivalent to a compartment wall with the same duration as the compartment floor.
JUNCTIONS
D3.15 Where a compartment wall or compartment floor meets an external wall, a separating wall or a compartment
wall, the junction must maintain the required level of fire safety performance of the compartment
wall or compartment floor.
D3.16*Where a compartment wall forms a junction with a roof, a suitable form of roof construction must be
adopted.
D3.17 In a hospital where a compartment wall meets an external wall there must be a 1 m wide strip of the
external wall which has the same level of fire safety performance as the compartment wall to prevent
lateral fire spread.
D4 Sub-compartmentation
BUILDINGS OF PURPOSE SUB-GROUP 2A
D4.1 In order to aid progressive horizontal evacuation and to limit fire spread in a building of purpose subgroup
2A, every compartment must be divided into sub-compartments by sub-compartment walls with a
level of fire safety performance (see D1.3) with a short duration so that no sub-compartment is greater
than 750 m 2 .
D4.2 In a building of purpose sub-group 2A the following rooms must be enclosed with the same level of fire
safety performance as that required for a sub-compartment -
a. chemical stores;
b. cleaners’ rooms;
c. clothes storage;
d. dayrooms with a floor area greater than 20 m 2 ;
e. smoking rooms;
f. disposal rooms;
Amdt: September 2001
12D